Calculate Compression Strength for Wood
Fc - Reference design value for compression parallel to grain
A - Cross section area of member
Cd - Load duration factor
Cm - Wet service factor
Ct - Temperature factor
Ci - Incising factor
Cf - Size factor
Cp - Column stability factor
TEF - Time effect factor
P'(ASD) - the adjusted compression capacity
P'(LRFD) - the adjusted compression capacity